Achieving centimeter-level precision in GPS technology typically requires specialized equipment, such as high-end GPS systems that can cost around $20,000. These systems can provide accuracy within 1 to 1.5 centimeters, but they necessitate multiple units to reach this level of precision. In contrast, standard handheld GPS devices, like the Garmin E-Trex, generally offer accuracy within 3 to 5 meters. It is also noted that vertical accuracy tends to be about half that of horizontal accuracy; for instance, if horizontal accuracy is 1 centimeter, vertical accuracy is approximately 2 centimeters under optimal conditions.
